The Orqa Original Battery should be recharged once the battery voltage is low. To charge the battery you will need the battery charger with the Li-ion or Li-Po charging profile. The best way to recharge the battery is the “balance charge” option. 

That means that the charger will make sure that the cells inside the battery will always be charged to the same voltage. Having the cells balanced will ensure the long-time optimum battery performance. 

The optimal charging current should be set to 1.0A max. The battery should be fully charged to 8.4V (4.2V per cell). The fully charged battery will have all four bars lit.